The decision of how to compress each channel is an implicit thing internal
to the openexr lib currently.

There isn't a method to test how a channel will be handled, but the logic
is basically:

If the channel name (not the layer name) is R, G, B, Y, YR, or YB, it will
be lossy compressed.

If the channel name is A, it will have a lossless method that works
reasonably with alpha.

And otherwise, its basically zip compressed.

Hope that helps!

On Wednesday, October 12, 2016, kiran nani <> wrote:

> Hello all,
> Sorry for this new noob question. I heard DWAA compressor, automatically
> does compression based on channel name. I have an output file but can't
> list it's compression type for each channel individually.I have checked in
> nuke It's listing overall file compression type.
> Is there any tool available to list it individually per channel?
> Thankyou.
> Regards,
> Kiran.B
> ​.​
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